Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\frac { a ( a + b ) } { a - b } \times \frac { a - b } { b ( a + b ) } \times \frac { a } { b }$$

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